DIAMOND GLASS‑WARE COMPANY, Indiana, PA (1913‑1931).
This company was formed in 1913 when Thomas and Alfred Dugan resigned from what had been the Dugan Glass Company. The factory was originally built in 1892 as the home of the Indiana Glass Company; however that company was beset with financial woes and was forced to close its doors in 1894. The factory was then leased to Harry Northwood and was the site of the Northwood Company until they joined with the National Glass Company in 1899. In 1904 the plant was sold to a group of investors who formed the Dugan Glass Company, which it remained until 1913. While under the management of the Dugan brothers the company had introduced a line of iridescent glassware known today as carnival glass. The Diamond organization expanded this popular line and also specialized in fine handmade light cut and decorated tableware. After succumbing to a fire on June 27 in 1931, the company was never reopened.
? From The Glass Candlestick Book, volume 1, by Tom Felt, Rich & Elaine Stoer (reprinted with permission)